GoPro Grand Prix of Sonoma – Friday – 3:30pm – first hour of practice, Firestone notes and more

 1st hour of practice   The 3.5 hour test session began promptly at 2:30pm and the temperature was a steamy 94F with the track at 129F. Most drivers immediately did a quick install lap, but the track immediately went red when the No. 25 of Oriol Servia lost power at the exit of Turn 2. …

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